Our country is a theatre, which exhibits, in full operation, two radically different political systems; the one resting on the basis of servile or slave labor, the other on voluntary labor of freemen. The laborers who are enslaved are all negroes, or persons more or less purely of African derivation. But this is only accidental. The principle of the system is, that labor in every society, by whomsoever performed, is necessarily unintellectual, grovelling and base; and that the laborer, equally for his own good and for the welfare of the State, ought to be enslaved. The white laboring man, whether native or foreigner, is not enslaved, only because he cannot, as yet, be reduced to bondage.

… This African slave system is one which, in its origin and in its growth, has been altogether foreign from the habits of the races which colonized these States, and established civilization here. It was introduced on this continent as an engine of conquest, and for the establishment of monarchical power, by the Portuguese and the Spaniards, and was rapidly extended by them all over South America, Central America, Louisiana, and Mexico. Its legitimate fruits are seen in the poverty, imbecility, and anarchy which now pervade all Portuguese and Spanish America. The free-labor system is of German extraction, and it was established in our country by emigrants from Sweden, Holland, Germany, Great Britain, and Ireland. We justly ascribe to its influences the strength, wealth, greatness, intelligence, and freedom, which the whole American people now enjoy. One of the chief elements of the value of human life is freedom in the pursuit of happiness. The slave system is not only intolerable, unjust, and inhuman, toward the laborer, whom, only because he is a laborer, it loads down with chains and converts into merchandise, but is scarcely less severe upon the freeman, to whom, only because he is a laborer from necessity, it denies facilities for employment, and whom it expels from the community because it cannot enslave and convert into merchandise also. It is necessarily improvident and ruinous, because, as a general truth, communities prosper and flourish, or droop and decline, in just the degree that they practise or neglect to practise the primary duties of justice and humanity. The free-labor system conforms to the divine law of equality, which is written in the hearts and consciences of man, and therefore is always and everywhere beneficent.

The slave system is one of constant danger, distrust, suspicion, and watchfulness. It debases those whose toil alone can produce wealth and resources for defence, to the lowest degree of which human nature is capable, to guard against mutiny and insurrection, and thus wastes energies which otherwise might be employed in national development and aggrandizement. The free-labor system educates all alike, and by opening all the fields of industrial employment and all the departments of authority, to the unchecked and equal rivalry of all classes of men, at once secures universal contentment, and brings into the highest possible activity all the physical, moral, and social energies of the whole state. In states where the slave system prevails, the masters, directly or indirectly, secure all political power, and constitute a ruling aristocracy. In states where the free-labor system prevails, universal suffrage necessarily obtains, and the state inevitably becomes, sooner or later, a republic or democracy.

… It was the antagonistic political tendencies of the two systems which the first Napoleon was contemplating when he predicted that Europe would ultimately be either all Cossack or all republican. Never did human sagacity utter a more pregnant truth. The two systems are at once perceived to be incongruous. But they are more than incongruous—they are incompatible. They never have permanently existed together in one country, and they never can….

Hitherto, the two systems have existed in different States, but side by side within the American Union. This has happened because the Union is a confederation of States. But in another aspect the United States constitute only one nation. Increase of population, which is filling the States out to their very borders, together with a new and extended network of railroads and other avenues, and an internal commerce which daily becomes more intimate, is rapidly bringing the States into a higher and more perfect social unity or consolidation. Thus, these antagonistic systems are continually coming into closer contact, and collision results.

Shall I tell you what this collision means? They who think that it is accidental, unnecessary, the work of interested or fanatical agitators, and therefor ephemeral, mistake the case altogether. It is an irrepressible conflict between opposing and enduring forces, and it means that the United States must and will, sooner or later, become either entirely a slaveholding nation, or entirely a free-labor nation. Either the cotton and rice fields of South Carolina and the sugar plantations of Louisiana will ultimately be tilled by free labor, and Charleston and New Orleans become marts of legitimate merchandise alone, or else the rye-fields and wheat-fields of Massachusetts and New York must again be surrendered by their farmers to slave culture and to the production of slaves, and Boston and New York becomes once more markets for trade in the bodies and souls of men. It is the failure to apprehend this great truth that induces so many unsuccessful attempts at final compromises between the slave and free States, and it is the existence of this great fact that renders all such pretended compromises, when made, vain and ephemeral. Startling as this saying may appear to you, fellow-citizens, it is by no means an original or even a modern one. Our forefathers knew it to be true, and unanimously acted upon it when they framed the constitution of the United States. They regarded the existence of the servile system in so many of the States with sorrow and shame, which they openly confessed, and they looked upon the collision between them, which was then just revealing itself, and which we are now accustomed to deplore, with favor and hope. They knew that one or the other system must exclusively prevail.

Unlike too many of those who in modem time invoke their authority, they had a choice between the two. They preferred the system of free labor, and they determined to organize the government, and so direct its activity, that that system should surely and certainly prevail. For this purpose, and no other, they based the whole structure of the government broadly on the principle that all men are created equal, and therefore free — little dreaming that, within the short period of one hundred years, their descendants would bear to be told by any orator, however popular, that the utterance of that principle was merely a rhetorical rhapsody; or by any judge, however venerated, that it was attended by mental reservation, which rendered it hypocritical and false….

… If these States are to again become universally slaveholding, I do not pretend to say with what violations of the constitution that end shall be accomplished. On the other hand, while I do confidently believe and hope that my country will yet become a land of universal freedom, I do not expect that it will be made so otherwise than through the action of the several States co-operating with the federal government, and all acting in strict conformity with their respective constitutions.

The strife and contentions concerning slavery, which gently disposed persons so habitually deprecate, are nothing more than the ripening of the conflict which the fathers themselves not only thus regarded with favor, but which they may be said to have instituted….

Source: William H. Seward, “On the Irrepressible Conflict” (speech, Rochester, NY, October 25, 1858), archive.org/stream/irrepressiblecon00sewa#page/n1/mode/2up.